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v2.4.1.9

Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
20% of net unearned premium | $ 71,907 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve | $ 68,586 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve
Discounting of loss reserves and salvage and subrogation recoverable for tax purposes | 11,100 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves | 12,810 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Write-down of impaired investments | 942 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses | 1,714 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Tax credit carryforward | 31,198 us-gaap_TaxCreditCarryforwardDeferredTaxAsset | 40,309 us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Expense accruals | 13,395 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves | 12,497 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Other deferred tax assets | 7,448 us-gaap_DeferredTaxAssetsOther | 5,653 us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets | 135,990 us-gaap_DeferredTaxAssetsGross | 141,569 us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities: |  |
Deferred acquisition costs | (69,021)mcy_DeferredTaxLiabilitiesAcquisitionCosts | (68,063)mcy_DeferredTaxLiabilitiesAcquisitionCosts
Tax liability on net unrealized gain on securities carried at fair value | (47,333)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities | (33,964)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Tax depreciation in excess of book depreciation | (9,414)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (9,667)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Undistributed earnings of insurance subsidiaries | (4,486)mcy_DeferredTaxLiabilitiesUndistributedInsuranceSubsidiaries | (4,024)mcy_DeferredTaxLiabilitiesUndistributedInsuranceSubsidiaries
Tax amortization in excess of book amortization | (1,982)mcy_DeferredTaxLiabilitiesTaxAmortizationInExcessOfBookAmortization | (1,447)mcy_DeferredTaxLiabilitiesTaxAmortizationInExcessOfBookAmortization
Other deferred tax liabilities | (9,087)us-gaap_DeferredTaxLiabilitiesOther | (9,184)us-gaap_DeferredTaxLiabilitiesOther
Total gross deferred tax liabilities | (141,323)us-gaap_DeferredTaxLiabilities | (126,349)us-gaap_DeferredTaxLiabilities
Net deferred tax (liabilities) assets | $ (5,333)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 15,220 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the unearned premiums reserve. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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